manully sync up to 1634d8f9f72a626b16c55573d78e8da2d75e6356

(merging https://github.com/kubernetes/kubernetes/pull/42084). For the new publish
script to work, client-go has to be synced up to when k8s.io/kubernetes doesn't
include _vendor

rest/config_test.go

@@ -70,8 +70,10 @@ func TestIsConfigTransportTLS(t *testing.T) {
 		},
 		{
 			Config: &Config{
-				Host:     "1.2.3.4:567",
-				Insecure: true,
+				Host: "1.2.3.4:567",
+				TLSClientConfig: TLSClientConfig{
+					Insecure: true,
+				},
 			},
 			TransportTLS: true,
 		},